Guardian Security holds the line in the battle between good and evil, protecting a complacent world from the unseen terrors around them. The public knows the agency as ad adjunct to the justice system, chasing down those jump bail and making sure court rules are followed. But the unknown work carried out by Guardian agents keep life as most people know it on an even keel.

Chiana McFain is a tough as nails, no holds barred senior agent with Guardian Security, assigned to trace and dispose of hell rats, rogue vampires and other paranormal creatures. But she goes from hunter to hunted in a matter of seconds after a ghostly apparition touches her and brands her arm. Forced to face the reality that she's only half-human, she reaches out to the only other person who knows she's the daughter of a Valkyrie, the doctor who has developed a unique serum to hide her heritage from Odin himself.

Creed Davies cares about only one thing in life: Work. A free agent taking covert assignments from Guardian, he's committed to protecting Chiana from the spirit warrior stalking her – or killing her himself to keep Odin from this world. Desperation leads him to use a Sumarian binding spell to keep her near and keep himself safe from the mood swings of a new, untested serum. A fierce dedication to duty drives him to take any means necessary to save Chiana and his own soul.